Of the stories I read on the net, most seem scary about clots and stuff. So what contraception do you use at 18?

Contraception. You should discuss this with your gynecologist.The contraceptive choice depends on several factors, like your age, other coexisting medical comditions, family history and safety and effectiveness of the method you chose.Birth control pills are pretty safe for most of young people and you should discuss what kind are safe for you and choice of others like depo shots, iuds, etc.